<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="vue.js"></script>
</head>
<body>
    <div id="root">
        <div>青龙{{str}}</div>
        <div v-text="str">123</div>
        <div v-html="str">123</div>
    </div>
</body>
<script>
    new Vue({
        el: '#root',
        data: {
            str:"<h3>啦啦啦啦</h3>"
        }
    })
</script>
</html>